https://sourceware.org/bugzilla/show_bug.cgi?id=32390
Bug ID: 32390
Summary: [x86] GAS generates inconsistent instruction encoding
for and.
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: skpgkp2 at gmail dot com
Target Milestone: ---
gas generate bigger encoding depending on how immidiate parameter specified.
8 Byte encoding for and.
========================
$ cat y.s
__s:
and 63, %rdi
ret
$ gcc -c y.s && objdump -d y.o
y.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <__s>:
0: 48 23 3c 25 3f 00 00 and 0x3f,%rdi
7: 00
8: c3 ret
4 byte encoding for and.
========================
$ cat y.s
__s:
and $63, %rdi
ret
$ gcc -c y.s && objdump -d y.o
y.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <__s>:
0: 48 83 e7 3f and $0x3f,%rdi
4: c3 ret
Only difference is $ specifier in immediate operand.
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